| albuterol | (noun) a bronchodilator (trade names Ventolin or Proventil) used for asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects are tachycardia and shakiness | Synonyms: Proventil, Ventolin |
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| alcahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alkahest, universal solvent |
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| alcapton | (noun) an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine | Synonyms: alkapton, homogentisic acid |
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| alcaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alkaptonuria |
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| alchemist | (noun) one who was versed in the practice of alchemy and who sought an elixir of life and a panacea and an alkahest and the philosopher's stone | - |
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| aldosterone | (noun) a corticosteroid hormone that is secreted by the cortex of the adrenal gland; regulates salt (sodium and potassium) and water balance | - |
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| aldosteronism | (noun) a condition caused by overproduction of aldosterone | Synonyms: hyperaldosteronism |
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| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
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| aldotriose | (noun) Any aldose having three carbon atoms; in reality, just glyceraldehyde. | - |
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| alecost | (noun) tansy-scented Eurasian perennial herb with buttonlike yellow flowers; used as potherb or salad green and sometimes for potpourri or tea or flavoring; sometimes placed in genus Chrysanthemum | Synonyms: balsam herb, bible leaf, Chrysanthemum balsamita, costmary, mint geranium, Tanacetum balsamita |
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| alendronate | (noun) a tablet (trade name Fosamax) prescribed to prevent or treat osteoporosis in women after menopause | Synonyms: Fosamax |
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| alert | (noun) a warning serves to make you more alert to danger | Synonyms: alerting |
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| (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarm, alarum, warning signal |
| (noun) condition of heightened watchfulness or preparation for action | Synonyms: qui vive |
| alerting | (noun) a warning serves to make you more alert to danger | Synonyms: alert |
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| (noun) a state of readiness to respond | Synonyms: alertness |
| alertness | (noun) lively attentiveness | Synonyms: on the qui vive, sharp-sightedness |
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| (noun) the process of paying close and continuous attention | Synonyms: vigilance, wakefulness, watchfulness |
| (noun) a state of readiness to respond | Synonyms: alerting |
| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
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| algebraist | (noun) a mathematician whose specialty is algebra | - |
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| algidity | (noun) prostration characterized by cold and clammy skin and low blood pressure | - |
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| algometer | (noun) device for measuring pain caused by pressure | - |
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| algometry | (noun) measuring sensitivity to pain or pressure | - |
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| algorithm | (noun) a precise rule (or set of rules) specifying how to solve some problem | Synonyms: algorithmic program, algorithmic rule |
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| alienation | (noun) the action of alienating; the action of causing to become unfriendly | - |
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| (noun) (law) the voluntary and absolute transfer of title and possession of real property from one person to another | - |
| (noun) the feeling of being alienated from other people | Synonyms: disaffection, estrangement |
| (noun) separation resulting from hostility | Synonyms: estrangement |
| alienator | (noun) an unpleasant person who causes friendly people to become indifferent or unfriendly or hostile | - |
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| alienist | (noun) a psychiatrist and specialist in the legal aspects of mental illness | - |
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| alignment | (noun) the act of adjusting or aligning the parts of a device in relation to each other | - |
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| (noun) the spatial property possessed by an arrangement or position of things in a straight line or in parallel lines | - |
| (noun) (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac | Synonyms: conjunction |
| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alinement, alliance, coalition |
| aliment | (noun) a source of materials to nourish the body | Synonyms: alimentation, nourishment, nutriment, nutrition, sustenance, victuals |
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| alimentation | (noun) the act of supplying food and nourishment | Synonyms: feeding |
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| (noun) a source of materials to nourish the body | Synonyms: aliment, nourishment, nutriment, nutrition, sustenance, victuals |
| alinement | (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alliance, coalition |
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| aliquant | (noun) an integer that is not an exact divisor of some quantity | Synonyms: aliquant part |
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| aliquot | (noun) an integer that is an exact divisor of some quantity | Synonyms: aliquot part |
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| aliterate | (noun) a person who can read but is disinclined to derive information from literary sources | Synonyms: aliterate person |
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| alkahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alcahest, universal solvent |
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| alkalimetry | (noun) volumetric analysis using standard solutions of alkali to measure the amount of acid present | - |
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| alkalinity | (noun) pH values above 7 | - |
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| alkanet | (noun) perennial or biennial herb cultivated for its delicate usually blue flowers | Synonyms: Anchusa officinalis, bugloss |
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| alkapton | (noun) an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine | Synonyms: alcapton, homogentisic acid |
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| alkaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alcaptonuria |
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| alkylbenzenesulfonate | (noun) sulfonate of alkyl benzene | - |
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| allantois | (noun) the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) | - |
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| allegation | (noun) (law) a formal accusation against somebody (often in a court of law) | - |
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| (noun) statements affirming or denying certain matters of fact that you are prepared to prove | Synonyms: allegement |
| allegement | (noun) statements affirming or denying certain matters of fact that you are prepared to prove | Synonyms: allegation |
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| allegretto | (noun) a musical composition or musical passage to be performed at a somewhat quicker tempo than andante but not as fast as allegro | - |
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| (noun) a quicker tempo than andante but not as fast as allegro | - |
| allergist | (noun) a physician skilled in the diagnosis and treatment of allergies | - |
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| alleviant | (noun) remedy that alleviates pain without curing | Synonyms: alleviator, palliative |
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| alleviation | (noun) the act of reducing something unpleasant (as pain or annoyance) | Synonyms: easement, easing, relief |
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| (noun) the feeling that comes when something burdensome is removed or reduced | Synonyms: assuagement, relief |
| alleviator | (noun) remedy that alleviates pain without curing | Synonyms: alleviant, palliative |
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| (noun) a therapist who makes suffering more endurable | - |
| alligator | (noun) either of two amphibious reptiles related to crocodiles but with shorter broader snouts | Synonyms: gator |
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| (noun) leather made from alligator's hide | - |
| alligatorfish | (noun) small very elongate sea poachers | Synonyms: Aspidophoroides monopterygius |
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| alliteration | (noun) use of the same consonant at the beginning of each stressed syllable in a line of verse | Synonyms: beginning rhyme, head rhyme, initial rhyme |
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| alliterator | (noun) a speaker or writer who makes use of alliteration | - |
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| allmouth | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: angler, angler fish, anglerfish, goosefish, Lophius Americanus, lotte, monkfish |
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| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| allocation | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allotment, apportioning, apportionment, assignation, parceling, parcelling |
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| (noun) (computer science) the assignment of particular areas of a magnetic disk to particular data or instructions | Synonyms: storage allocation |
| (noun) a share set aside for a specific purpose | Synonyms: allotment |
| allocator | (noun) a person with authority to allot or deal out or apportion | Synonyms: distributor |
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| allocution | (noun) (rhetoric) a formal or authoritative address that advises or exhorts | - |
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| allograft | (noun) tissue or organ transplanted from a donor of the same species but different genetic makeup; recipient's immune system must be suppressed to prevent rejection of the graft | Synonyms: homograft |
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| allometry | (noun) the study of the relative growth of a part of an organism in relation to the growth of the whole | - |
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| allopathy | (noun) the usual method of treating disease with remedies that produce effects differing from those produced by the disease itself | - |
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| allopatry | (noun) the occurrence of related organisms in separate geographical areas with no overlap | - |
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| allotment | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, apportioning, apportionment, assignation, parceling, parcelling |
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| (noun) a share set aside for a specific purpose | Synonyms: allocation |
| allotrope | (noun) a structurally different form of an element | - |
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| allotropism | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropy |
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| allotropy | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropism |
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| allurement | (noun) the act of enticing a person to do something wrong (as an offer of sex in return for money) | Synonyms: solicitation |
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| (noun) the power to entice or attract through personal charm | Synonyms: allure, temptingness |
| (noun) attractiveness | - |
| alluviation | (noun) the phenomenon of sediment or gravel accumulating | Synonyms: deposit, sedimentation |
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| almandite | (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandine |
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| alpenstock | (noun) a stout staff with a metal point; used by mountain climbers | - |
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| alphabet | (noun) the elementary stages of any subject (usually plural) | Synonyms: first principles, rudiments |
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| (noun) a character set that includes letters and is used to write a language | Synonyms: ABC's, ABC, ABCs |
| alphabetisation | (noun) the act of putting in alphabetical order | Synonyms: alphabetization |
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| alphabetiser | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetizer |
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| alphabetization | (noun) the act of putting in alphabetical order | Synonyms: alphabetisation |
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| alphabetizer | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetiser |
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| alpinist | (noun) a mountain climber who specializes in difficult climbs | - |
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| alsatian | (noun) breed of large shepherd dogs used in police work and as a guide for the blind | Synonyms: German police dog, German shepherd, German shepherd dog |
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| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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| altar | (noun) a raised structure on which gifts or sacrifices to a god are made | - |
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| (noun) the table in Christian churches where communion is given | Synonyms: communion table, Lord's table |
| altarpiece | (noun) a painted or carved screen placed above and behind an altar or communion table | Synonyms: reredos |
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| altazimuth | (noun) an instrument that measures the altitude and azimuth of celestial bodies; used in navigation | - |
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| altcoin | (noun) an alternative cryptocurrency | - |
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| alterability | (noun) the quality of being alterable | - |
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| alteration | (noun) the act of revising or altering (involving reconsideration and modification) | Synonyms: revision |
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| (noun) the act of making something different (as e.g. the size of a garment) | Synonyms: adjustment, modification |
| (noun) an event that occurs when something passes from one state or phase to another | Synonyms: change, modification |
| altercation | (noun) noisy quarrel | Synonyms: affray, fracas |
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| altering | (noun) the sterilization of an animal | Synonyms: fixing, neutering |
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| alternate | (noun) someone who takes the place of another person | Synonyms: replacement, surrogate |
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| alternation | (noun) successive change from one thing or state to another and back again | - |
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| alternative | (noun) one of a number of things from which only one can be chosen | Synonyms: choice, option |
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| alternator | (noun) an old term for an electric generator that produces alternating current (especially in automobiles) | - |
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| althaea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althea, hollyhock |
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| althea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althaea, hollyhock |
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| altimeter | (noun) an instrument that measures the height above ground; used in navigation | - |
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| altitude | (noun) elevation especially above sea level or above the earth's surface | Synonyms: height |
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| (noun) angular distance above the horizon (especially of a celestial object) | Synonyms: ALT, EL, elevation |
| (noun) the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel) | - |
| alto | (noun) the pitch range of the lowest female voice | - |
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| (noun) (of a musical instrument) the second highest instrument in a family of musical instruments | - |
| (noun) the lowest female singing voice | Synonyms: contralto |
| (noun) the highest adult male singing voice | Synonyms: countertenor |
| (noun) a singer whose voice lies in the alto clef | - |
| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| altogether | (noun) informal terms for nakedness | Synonyms: birthday suit, raw |
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| altoist | (noun) a musician who plays the alto saxophone | Synonyms: alto saxophonist |
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| altostratus | (noun) a stratus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altostratus cloud |
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| altruism | (noun) the quality of unselfish concern for the welfare of others | Synonyms: selflessness |
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| altruist | (noun) someone who makes charitable donations intended to increase human well-being | Synonyms: philanthropist |
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| aluminate | (noun) a compound of alumina and a metallic oxide | - |
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| alumroot | (noun) any of several herbs of the genus Heuchera | Synonyms: alumbloom |
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| alveolitis | (noun) inflammation of the alveoli in the lungs caused by inhaling dust; with repeated exposure the condition may become chronic | - |
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| (noun) inflammation in the socket of a tooth; sometimes occurs after a tooth is extracted and a blood clot fails to form | Synonyms: dry socket |